Air heater



Feb. 7, 1928. 1,658,198 J C. HOSCH AIR HEATER Filed Sept. 7, 1926 2Sheets-Sheet 1 T ql k z I l N V E N TO R Z J C/m/o c Hosch BY 'fi a/wdATTOR N EY Feb. 7, 1928. 1,658,198

' I I J C. HOSCH AIR HEATER Filed Sept. 7. 1926 2 Sheets-Sheet 2 IN V ENTO R J C/qud Host-b BY ATTORNEY Patented Feb. 7, 1928.

PATENT OFFICE.

J cumminoscn, or Losmcnms, canmonm AIR HEATER.

Application filed September'l, 1926. Serial No. 133,988.

This invention relates to heaters, and more particularly to air heatersthat serve to provide a large current of heated air to a space tobe'warmed.

Such heaters have been used in the past for lar e buildings, such aschurches, theatres, c ubhouses and the like; Usually a fan is used toinduce a draft of air that is to be warmed by the heater, and to passthe heated air into the space to be heated. Such heaters of the priorart were not only expensive to manufacture, but were also dif-' ficultto install.

It is one of the objects of my inventioni to provide a compact,eflicient heater of inexpensive construction.

It is another object of my invention to make it possible to assemble theheater parts pact. j My invention -possesses many other advanta es, andhas other objects which may in a convenient and rapid manner.

In order to accomplish these objects, I provide a heater utilizing fluidfuel, such as gas or vaporized oil, in which there are a plurality offuel. burners, each of which utilizes a forced draft to send theproducts of combustion through conduitsthat are heated by said products.are placed in the path of the draft of air to be'heated, whereby thereis a large heat transfer. It is accordingly still another object of myinvention to provide a heater in which heat is imparted to. heaterconduits directly from the products of combustion. The advantage of suchan arrangement is that, the conduits serving the double purose ofcarrying} off the products of comustion as well as of imparting heat tothe air, the entire heater can be made very combe ma c more easilyapparent from a consi cration of one embodiment of my invention. Forthis urpose I have shown a form in the drawings accompanying and formingpart of the present application. I shall now roceed to describe thisform in detail, which illustrates the general principles of myinvention; but it isto be understood that this detailed description isnot to be taken in a limiting sense,- since the scope of my inven tionis best defined by the appended claims.

Referring to the. drawings: a

E Figure I is a diagrammatic view of a These conduits in turn.

Fig. 6 is a further detail showing another feature of construction.

In Fig. 1 only a part of a building to be heated is disclosed. A ceiling11 is shown, above which the heater installation is rovi ded, theconvection currents pf heate air being forced through the grille oropening 12. Clean air is takenfrom the outside of the building throughlouver 13. The heater 14, in this'instance shown as substantiallyrectangular, can be placed adjacent the louver 13, so that the aircoming in therethrough is heated, and is forced through the heater by afan located in casing 15. This fan is shown as belt driven from a smallmotor 16, and serves to produce an effective. draftof air through theopenings 12. 'There may or may not be exhaust openings at points distantfrom grille 12; and since in general the broad idea of circulatingheated air through a space is now well-known, further detailing isconsidered unnecessary.

The heater 14 is of box-like form, open at those sides which arerespectively adjacentthe louver 13 and the fan encased in a frame 15.Disposed in the box-like space, and over which the air from louver 13must pass, are a series of convoluted horizontal conduits 17, 18, and19. These conduits are formed of steel or iron tubing, and serve toconduct the products of combustion to stacks 20, 21, and 22,respectively. In order mentof conduits 17, 18, and 19. As shown mostclearly in Fig. 4, these three conduits form a vertical'series, oneabove the other.

The topmost conduit 17 for example, extends through the side of theheater 14 at 25 (Figs. 1 and 3), whence it has a horizontal portionextending almost to the other side of the heater. It is thisfirstsection in which the fuel burner 26 extends, to which fuel, such as gasor vaporized oil is fed as from a' valved ipe 27. A spark plug 28 placedadjacent t e burner opening is used to ignite the fuel in this conduitsection. A burner guard 29 can also be placed about the front .end ofthe burner in the form of a projection; and the burner itself can besupported in any appropriate fashion at the opening 25 of conduit 17.

Since it is this first section of conduit 17 i that is subjected to themost intense heat, it

"slightly 'above this first section, and to that side at whichburner 26is supported; thence there is a downward dip 33 (Fig. 3) leading toanother horizontal section. 35 at about the same level as the firstsection, and extending across. the heater. Finally there is an upwardrise 36, connectingto the last section 38, to which stack 20 connects.It is thus seen that the conduit 17 progresses from side to side of theheater, the successive horizontal portions being slightly displacedvertically from the preceding horizontal portion. In this way, itisensured that air from louver 13 will pass intimately around all portionsof the conduit and will be heated thereby.

Since the flame from heater .26 projects horizontally and since theproducts f combustion must also pass through lon horizontal passagewaysto which these products impart heat, I find it advantageous tosupply'aforced draft,as by pipe 39 connected to a blower 40 andsurrounding the burner 26. The blower also assists in rovidingSlll'fiClGIlt air for complete combustlon of the fuel, andby the aid ofpipe 50, to impart forced draft to the upright flues.-

The conduits 18 and 19 are entirely simi 15111111 structure to conduit17 just detailed; but they are placed at successively lower levels. Eachhas its burner 41 and 42 respectively supplied from the same source offuel as burner 26.

It is to benoted that. the air coming through louver 13 impinges firston the tions.

and as it pro resses through the heater, it

adually strlkes hotter portions until it.

ally passes over that section in which the burner flame is produced. Inthis way, the temperature of the air is more uniformly and evenlyraised. Furthermore, this cool air takes up' the heat from thosesections which are active in the stacks;.and this is done efliciently onaccount of the large temperature difference between these sections andthe air. The net result, is an increase in stack efliciency due todecrease in stack heat.

The conduits 17, 18 and 19 are housed, as hereinbefore mentioned, in abox-like structure, the wall construction of which is most clearlyillustrated in Fig. 5. Of course, that side of the casing adjacentlouver 13, as well as the opposite side, is open to permit air to travelthrough the heater; but the top and bottom and the other two sides arewalled by panels that are fastened to the four corner pieces 43 (Fig.2). These corner pieces may be angle irons. The construction of thewalls is double. The panels '44 are shown as joined together withtongueand-groove joints; one edge of each panel being formed with atongue such as 45,

which is adapted to fit into a cap 46 form-"9' mg a groove 47. This capfits between the walls 48 of the adjacent panel .44, and

serves to retain heat insulation 49, such as featherstone, in place. Thecap is welded in place after the insulation is packed between the'wallsof the panel.

The panels 44 can be shipped com actly and can be fastened to the cornerang es 43 at the scene of installation.

I claim: 1. In a heater, a box-like structure having an open .front andback, means for causing air to pass through saidstructure by way of saidopen front and back, a convo-. luted conduit extending across thestructure in. the path of the an, said conduit having a plurality ofhorizontal sections, and

cooler parts of the conduits 17, 18, and 19;

a horizontally arranged burner projecting into the end of one of thehorizontal sec- 2. In a heater, a box-like structure having an openfront and back, means" for causing air to pass through said structure byway of said open front and back, a convoluted conduit having a series ofhorizontal sections at diflerent levels extending across the structurein the path of the air, a horizontally arranged burner projecting Intothe end of one of the sections.-

3. In a heater, a plurality of horizontally arranged burners, saidburners forming a vertical series, a plurality of convoluted,substantially horizontal conduits, one for each burner, the burnerassociated with each conduit projecting into one end thereof, saidconduits serving to carry ofi the products of combustion, and means formoving air over the conduits.

4. In a heater, a box-like structure having an open front and back,means for causing air to pass through said structure by way of said openfront and back, a plurality of convoluted conduits,each having'a seriesof horizontal sections at different levels extending across thestructure in thepath of the air, said conduits being arranged one overthe other, and a horizontally arranged burner for each conduit,-projecting into the end of-the associated conduit. v

5. In a heater, a horizontally arranged burner, a convoluted, horizontalconduit for leading off the products of combustion and encompassing theburner, said conduit having a plurality of horizontal series sections,and means whereby that section in which the heaterlis disposed can bedisconnected from the other sections.

6. In a heater, a substantially horizontal conduit, a fluid fuel burnerextending into one end of the conduit, said conduit having convolutionsfor carryingbff the products of combustion, and means for. passing airaround said conduit for heating it, the air passin first around thatportion of the conduit which is most remote from the burner. 7. In aheater, a substantially horizontal conduit, a fluid fuel burnerextending into one end of the conduit, said conduit having" convolutionsfor carrying off the products of combustion means for passingair aroundsaid conduit for heatingit, the air passing first around that portlon ofthe conduit which is most remote from the burner, a vertical stackconnecting to said conduit, and means ,for applying a forced draft tothe vertical stack.

8. In a heater, a casing having enclosing I the casing and connected tothe other end ofthe conduit, and a fan arranged adjacent the burner endof the casing for draws ing air theret-hrough.

J 9. In a heater, a casing having open ends,"

lattice frameworkadjacent each of.the sides of said casing a horizontalconduit supported on said framework so as to extend across the casing, afluid fuel burner extendinginto one end-of the conduit, and a stack incommunication with the other end.

10. Ina heater, a box-like casing, said at the fan end, a stack for eachof the con duits adjacent the louver end, and a blower for providing airaround the burners and for providing a forced draft in the stacks.

In testimony whereof I have, hereunto set m hand.- r y J CLAUDE

